应用程序在尝试绑定隔离存储映像时崩溃 [英] App crashes while trying to bind the Isolated Storage Image

问题描述

在我的应用程序中，我使用下面提到的辅助方法将我的隔离存储图像绑定到图像控件.我从链接将独立存储中存储的图像绑定到 Windows Phone 中的图像控件"

In my application I am using the below mentioned helper method for binding my Isolated storage image to Image control. I got this helper method from the link "Binding Image stored in the Isolated Storage to Image Control in Windows Phone"

public class IsoStoreImageSource : DependencyObject
{
public static void SetIsoStoreFileName(UIElement element, string value)
{
    element.SetValue(IsoStoreFileNameProperty, value);
}
public static string GetIsoStoreFileName(UIElement element)
{
    return (string)element.GetValue(IsoStoreFileNameProperty);
}

// Using a DependencyProperty as the backing store for IsoStoreFileName.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty IsoStoreFileNameProperty =
    DependencyProperty.RegisterAttached("IsoStoreFileName", typeof(string), typeof(IsoStoreImageSource), new PropertyMetadata("", Changed));

private static void Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    Image img = d as Image;

    if (img != null)
    {
        var path = e.NewValue as string;
        SynchronizationContext uiThread = SynchronizationContext.Current;

        Task.Factory.StartNew(() =>
        {
            using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (isoStore.FileExists(path))
                {
                    var stream = isoStore.OpenFile(path, System.IO.FileMode.Open, FileAccess.Read);
                    uiThread.Post(_ =>
                    {
                        var _img = new BitmapImage();
                        _img.SetSource(stream);
                        img.Source = _img;
                    }, null);
                }
            }
        });               
    }
}

}

我在 ListBox 控件中使用它.如果尝试使用默认库图像，一切都会按预期工作.但是如果我尝试使用大尺寸的图像(通过设备相机拍摄)，应用程序就会崩溃.

I am using this inside a ListBox control. And if try with default library images everything will work as expected. But if I try with the images with large size( taken through device camera ) the app crashes.

这是我得到的例外

System.Windows.ni.dll 中出现类型为System.OutOfMemoryException"的异常，但未在用户代码中处理

An exception of type 'System.OutOfMemoryException' occurred in System.Windows.ni.dll but was not handled in user code

堆栈跟踪

在 MS.Internal.FrameworkCallbacks.NotifyManagedDebuggerOnNativeOOM()在 MS.Internal.XcpImports.BitmapSource_SetSource(BitmapSource bitmapSource, CValue& byteStream)在 System.Windows.Media.Imaging.BitmapSource.SetSourceInternal(Stream streamSource)在 System.Windows.Media.Imaging.BitmapImage.SetSourceInternal(Stream streamSource)在 System.Windows.Media.Imaging.BitmapSource.SetSource(Stream streamSource)在 MyaPP.Common.IsoStoreImageSource.<>c__DisplayClass4.<>c__DisplayClass6.b__1(Object _)

at MS.Internal.FrameworkCallbacks.NotifyManagedDebuggerOnNativeOOM() at MS.Internal.XcpImports.BitmapSource_SetSource(BitmapSource bitmapSource, CValue& byteStream) at System.Windows.Media.Imaging.BitmapSource.SetSourceInternal(Stream streamSource) at System.Windows.Media.Imaging.BitmapImage.SetSourceInternal(Stream streamSource) at System.Windows.Media.Imaging.BitmapSource.SetSource(Stream streamSource) at MyaPP.Common.IsoStoreImageSource.<>c__DisplayClass4.<>c__DisplayClass6.b__1(Object _)

推荐答案

你可以这样试试，Stream对象会自动释放.

You can try like this, Stream object will automatically disposed.

using (IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication())
{                               
     if (iso.FileExists(imagePath))
     {
         using (Stream imagestream = new IsolatedStorageFileStream(imagePath, FileMode.Open, FileAccess.Read, FileShare.Read, iso))
         {
               BitmapImage bmp = new BitmapImage();
               bmp.SetSource(imagestream);
               imgControl.Source = bmp;
         }
     }
}

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